The theoretical physics group of the Instituto de Física y Astronomía at the Universidad de Valparaíso does research in several areas, ranging from the very small - as in the study of elementary particles - to the largest scales imagined – as is given in the study of theories of gravitation and cosmology. These complement each other, since its members work on converging themes, besides being related to astrophysics. In our institute various topics are discussed in the following areas: